Externo-Skel provides added supp0ort and abrasion resistance to the exterior of the skate Reflex-Bar isolates the natural flexion zone of the skate to promote increased agility Extreme PVC outer layer improves abrasion resistance and durability Microtex glow uppers PU coated for increased durability. E-composite glass outsole for increased torsional stiffness and energy transfer Comfort ankle pockets provide immediate fit & comfort. Prolite step 7000 extruded aluminum chassis provides an "ice hockey like" profile, single axle system Hyper Duality wheels-dual pour wheel provides increased grip, speed and control BSB ABEC 5 micro bearings offers high quality precision at 66% less weight